Radiant Floor Heating Pipe Sizes


Radiant, or underfloor, heating takes advantage of the thermal properties of concrete to heat the building’s occupants. This is achieved by running water (or a mix of water and antifreeze) through a network of RAUPEX piping embedded in the concrete floor. Heat radiates from the pipes to the room’s occupants and objects in the space, making it a comfortable way to heat a building.

PEX piping is used for radiant floor heating because of its flexibility, resistance to corrosion and ease of installation. A variety of tubing diameters and spacing options are available to match your project’s requirements. The sizing of the tubing depends on how much heat output is required and what the water temperature will be.

The smallest standard pipe size works well in efficiently-insulated residential homes and other smaller spaces. In well-insulated homes and spaces, the ideal tube spacing is 12 inches on center. For less-insulated, larger spaces or those requiring higher heat output, wider spaced tubes are needed.

If you are unsure about what size tubing to use, our experts are happy to help. Just reach out to us with your project details, whether the system is primary or supplemental and we’ll show you what options are best. You can also get started with our Instant Quote tool, which will guide you through the process step by step. Simply enter your project’s square footage, length and width or upload a floor plan. You can even calculate your project’s energy costs and see what the monthly cost will be.  floor heating pipe